Optimal investment in generic advertising and basic research: The case of the Canadian supply managed egg market / Karen Chyc, Ellen Goddard. -- Guelph : University of Guelph, 1992. -- 32 s. : 5 obr., 8 tab. -- (Working Papers Series 92/2. Department of Agric. econ. and business). vajcia * obchod s vajciami * investície poľnohospodárske